2008 AUDI A8 Power Train Problems

I OWN A 2008 AUDI A8 WITH ABOUT 48200 MILES. IT IS GREAT VEHICLE BUT HAVING PROBLEMS WITH TRANSMISSION DURING DRIVING. UNDER LOAD IT WILL GO IN FAIL SAFE MODE AROUND 4,5,6 GEARS. IT IS CAUSING DANGEROUS SITUATIONS AS CAR STARTS STOPPING SUDDENLY AND CAUSING DRIVER MOMENTARILY LOOSE CONTROL OF A VEHICLE. THIS IISSUE WAS BROUGHT UP TO A AUDI BUT THEY SAID IT IS PAST WARRANTY. BY DOING AN INDEPENDENT RESEARCH, IT WAS FOUND THAT THERE IS ONE SINGLE TEFLON SEAL CONTROLLING FLUID PRESSURE FOR A CLUTCH E.THAT SEAL WEARS OUT PREMATURELY CAUSING FLUID TO LOOSE PRESSURE AND FAILING SAFE TRANSMISSION. IN ORDER TO REPAIR THIS ISSUE SEAL NEEDS TO BE REPLACED WITH AFTERMARKET ONE. INFORMATION ABOUT IT WAS OBTAINED FROM ZF TRANSMISSION SERVICE BULLETIN AND IS AVAILABLE ONLINE. ZF MANUFACTURING KNOWS ABOUT THIS AND REBUILDING THIS TRANSMISSION. WHEN FLUID PRESSURE IS LOST IT CAUSING TRANSMISSION FAIL SAFE IN...

AUTOMATIC TRANSMISSION GOING INTO FAIL SAFE MODE DURING DRIVING AROUND 4,5,6 GEARS WHEN GOING AROUND 70+ MPH AND RELEASE GAS PEDAL AND APPLYING GAS AGAIN IN ORDER TO PASS VEHICLE. CAR GOES INTO FAIL SAFE MODE, NEEDS TO BE PULLED OVER TO RESTART AND RESET TRANSMISSION. CAR WAS TAKEN TO A AUDI DEALER FOR AN INSPECTION AND BY TECHNICIAN AT FLUID LEVEL WAS LOW. TOP UP TRANS FLUID . WAS DRIVING OK FOR TWO WEEKS , PROBLEM STARTED AGAIN. TOOK CAR BACK TO A DEALER, TECHNICIAN CALLED AN AUDI SUPPORT CENTER. BY AUDI SUPPORT CENTER WAS RECOMMENDED TO REPLACE ATF FILTER WITH OPTIMIZED ATF FILTER. REASON FOR REPLACEMENT WAS SEAL ON A TOP OF ATF STRAINER THAT WAS SHRINKING BY TEMPERATURE OF FLUID ( PER ZF TRANSMISSION MANUFACTURERS.) BECAUSE OF DESIGN CHANGE , ATF STRAINER CAN COME LOOSE FROM THE GUIDE OF ATF PUMP INTAKE DUCT. AS A RESULT, AIR...